US4251693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixed impulse generator for hook switch flash
Assignee: Individual
•
Filing: 1978-08-03
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Granted: 1981-02-17
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Expires: 1998-08-03
Abstract
Abstract A hook switch flash generator to provide consistent, electronically controlled and timed flash signals independent of human variables. A user operated button switch is closed to initiate transmission of a predetermined duration pulse recognizable by the central office system or PBX as a hook switch flash.
Inventors
- 👤 Gary F. Christiansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:06
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/53
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
210 words
A hook switch flash generator circuit, for a telephone system including a telephone line with line voltage and a telephone set comprising: an RC timing network including a resistor and capacitor; charging means connecting the telephone line to the capacitor and adapted to charge said capacitor; a relay means having an actuating coil means connected in series with a solid state switch means having gate means connected in parallel with the said capacitor via a pair of normally open contacts of said relay means; said relay having a pair of normally closed contacts connected in series with the telephone set; switch means having normally open contacts connected across the normally open contacts of said relay means; and, said gate means being responsive to the closure of the normally open contact means of the switch means to fire said solid state switch means to actuate said relay means, latching said relay means through closure of said normally open contacts of the relay means and opening the normally closed contacts of the relay disconnecting the telephone set from the line for a predetermined period of time sufficient to permit said capacitor to discharge and to allow the relay to unlatch, closing the normally closed contacts reconnecting the telephone set to the line.
Claim 2
Dependent Claim
210 words
A hook switch flash generator circuit, for a telephone system including a telephone line with line voltage and a telephone set comprising: an RC timing network including a resistor and capacitor; charging means connecting the telephone line to the capacitor and adapted to charge said capacitor; a relay means having an actuating coil means connected in series with a solid state switch means having gate means connected in parallel with the said capacitor via a pair of normally open contacts of said relay means; said relay having a pair of normally closed contacts connected in series with the telephone set; switch means having normally open contacts connected across the normally open contacts of said relay means; and, said gate means being responsive to the closure of the normally open contact means of the switch means to fire said solid state switch means to actuate said relay means, latching said relay means through closure of said normally open contacts of the relay means and opening the normally closed contacts of the relay disconnecting the telephone set from the line for a predetermined period of time sufficient to permit said capacitor to discharge and to allow the relay to unlatch, closing the normally closed contacts reconnecting the telephone set to the line.
Claim 3
Dependent Claim
25 words
The generator of claim 1 wherein the charging means includes transistor and diode means connected to insure correct polarity and proper voltage to the generator.
Claim 4
Dependent Claim
25 words
The circuit of claim 2 wherein the switch means across the normally open contacts of the relay includes a capacitor in series with contact means.
Claim 5
Dependent Claim
25 words
The circuit of claim 1 wherein the switch means across the normally open contacts of the relay includes a capacitor in series with contact means.
Claim 6
Dependent Claim
16 words
The circuit of claim 1 wherein the solid state switch means is a silicon controlled rectifier.
Claim 7
Independent Claim
112 words
A method of providing a predetermined hook switch flash in a telephone system including a telephone set which comprises the steps of charging an RC timing circuit connected across the telephone line and discharging the timing circuit in response to the closure of a user operated switch through the actuating coil of a relay means having a pair of normally closed contacts positioned in the telephone line which are latched open during such discharge to completely and electrically disconnect the telephone set from the line to provide zero current flow through the contacts for a predetermined time interval so that the central office can identify the interval as a hook switch flash.
Claim 8
Independent Claim
112 words
A method of providing a predetermined hook switch flash in a telephone system including a telephone set which comprises the steps of charging an RC timing circuit connected across the telephone line and discharging the timing circuit in response to the closure of a user operated switch through the actuating coil of a relay means having a pair of normally closed contacts positioned in the telephone line which are latched open during such discharge to completely and electrically disconnect the telephone set from the line to provide zero current flow through the contacts for a predetermined time interval so that the central office can identify the interval as a hook switch flash.
Claim 9
Dependent Claim
174 words
A hook switch flash generator circuit for a telephone system including a telephone line with line voltage and a telephone set comprising: an RC timing network including a resistor and a capacitor connected across the line; charging means having a low impedance path connecting the telephone line to the capacitor and adapted on the capacitor becoming charged to remove the low impedance path from the telephone line; relay means having an actuating coil connected in parallel with the timing network through normally open contacts between said capacitor and ground potential, said relay having normally closed contacts connecting a telephone set to one side of the line; and, push button means adapted on closure to close the normally open contacts of the relay and to open the normally closed contacts to completely and electrically disconnect the telephone set from the line to provide zero current flow through the contacts and maintain the relay latched in this condition until the capacitor is discharged sufficient to release the relay and reconnect the telephone set to the line.
Claim 10
Dependent Claim
174 words
A hook switch flash generator circuit for a telephone system including a telephone line with line voltage and a telephone set comprising: an RC timing network including a resistor and a capacitor connected across the line; charging means having a low impedance path connecting the telephone line to the capacitor and adapted on the capacitor becoming charged to remove the low impedance path from the telephone line; relay means having an actuating coil connected in parallel with the timing network through normally open contacts between said capacitor and ground potential, said relay having normally closed contacts connecting a telephone set to one side of the line; and, push button means adapted on closure to close the normally open contacts of the relay and to open the normally closed contacts to completely and electrically disconnect the telephone set from the line to provide zero current flow through the contacts and maintain the relay latched in this condition until the capacitor is discharged sufficient to release the relay and reconnect the telephone set to the line.
References Cited (Backward Citations)
DE2432452A1
Cited
US4086440A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |